July 22, 2008
Laptops
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Wireless laptop computers are the best! Who can argue with the portability of a laptop computer compared to a desktop computer, and then add the ability to go wireless? Who wouldn’t go for that. Having a wireless laptop computer allows you to get things done just about anywhere, it is just a continuation of the de-centralization of the office place. There are a lot of different kinds of wireless technologies out there. The different technologies all do different things, and all cost different amounts. When you’re going to look into wireless laptops, here is some of the things to consider.
New computers are all coming with built in WiFi. Because of this standard, for the average user a new computer is all you need to have your wireless capabilities. The new computers have built in wi-fi that enables it to connect to the internet in a flash without a modem or NIC cards. A wireless laptop when powered up will search on its own for connectivity. This wireless capability allows you to get online at certain Internet capable hotspots in different areas.
There are however, other types of access that you can add on to your laptop.
Mobile broadband offers high speed data connectivity. Mobile broadband does come at a price premium. Typically, you need to sign up with a provider in much the same way that you sign up for a cellular service. Most of the people that you can get your cell service from offer broadband wireless capability. And, in much the same way that you sign up with a contract you do the same thing with your wireless broadband. Price ranges can vary, but typically you sign up for a year contract and pay monthly anywhere from 50 to 80 bucks a month. Depending on your area of this can be higher. The real benefit is that you are just about getting regular Internet service. The upload and download speeds are going to be faster, and this kind of connection is more secure.
With mobile broadband, you can also download larger email attachments and download complex files. The mobile broadband technology is more powerful and 10 times faster than the dial up technology that gives internet connection through your computer.
The wireless laptop computers with wi-fi connectivity allow you dual band connectivity at a public space or in the office to a local area network. The wireless cards can communicate with access points or routers. It acts like devices that send data back and forth with an antenna over the airwaves. What this means is that as long as there is a wireless router in the area, and you have access, you can connect to a local area network, or your company’s network and work on that network in real time. If you are using public access, you do need to be aware that you expose yourself to the potential that someone may hack into your computer. It is a good idea to install and use some kind of firewall protection.
There are also wireless laptops that have Bluetooth to enhance the rate of data through wireless technology. This Bluetooth technology would allow you to transfer the music and video files and also documents between your laptops and other personal devices. The introduction of Bluetooth is a new phase in the laptop world. It is very common to see a Bluetooth headset in your cell phones. Bluetooth integrating in the laptop is starting a new era in laptops. Keep in mind that your computer needs to be Bluetooth capable to utilize the Bluetooth technology. Many computers are coming standard with Bluetooth technology, but it is important to check.
Ultimately, the standard WiFi capability that a laptop comes with is plenty for the average user. With that capability you can jump onto hotspots, and if you have a wireless router in your home, you can tap into your high-speed Internet connection. For those that are using a computer for business, the broadband mobile card is a technology you may want to look into. Just make sure that the card will fit into your USB ports, or your laptop is enabled with the broadband card slot.
If you are looking for a bargain laptop computer , http://bargainlaptopcomputershop.com has the best price on a cheap laptop computer. When you are ready to buy a laptop computer, our pricing can’t be beat.
July 21, 2008
Laptops
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Finding a good computer is getting much easier these days. Finding a cheap computer is a different story. Now, make that the quest for a cheap laptop computer and things get a little more, complicated. However, do not worry there are things you can do. Let’s take a look at how to find a cheap laptop computer online.
Step one in the process is to get access to the Internet. Assuming you are reading this, you have that access. All kidding aside, if you need to get access, and you’re reading this through some other method, you can get to your library, or even Kmart offers free access. Worse case scenario, borrow a friend’s computer.
Once you get that access, go to the Internet and sign up for a paypal account. You can find them at paypal dot com. PayPal is an online payment service. You can use this service to purchase securely on the Internet.
The next step in this process, you want to go to ebay. They can be found at ebay dot com. Sign up for an account. Signing up for an account with eBay is free, so there is no cost.
Once you have your ebay account, you want to search for laptop computers. You will no doubt be offered something like 12,000 offerings. And the offerings will be from all the major suppliers. You can buy new, used, refurbished, and even broken computers.
You don’t want the broken computers, but there are still plenty of offerings. And you should be able to find something in the 200-300 dollar range.
Do not just buy the first laptop you see. Shop around. One of the things you may be tempted to do is buy quickly, but you should look at the items that have time left before the auction is over. Compare prices and features. There is another feature you can consider and it is called the buy it now feature. If you see what you like, and it is in the price range that you are looking for, you can purchase it right away with the buy now feature. Not all products are offered that way.
Decide what your budget is in relationship to what you want to do with it. If you are only looking to surf the web, and won’t be running lots of programs, then you can find something in the $200-300 range. Check out to see if the computer is wifi capable. Now, it is usually a standard feature, and with all the great hot spots, you should be able to get free internet access when you are drinking our java. In general, make sure you purchase a laptop that has at least 512 MB of RAM, and a 1 GB of disk storage. You should be a little find something with a built-in DVD player.
This next point is very important. Check out the seller feedback. If you are new to ebay, you need to make sure you buy from someone who has a good reputation. All sellers are rated, and you can read the ratings. People that have purchased in the past from this seller leave comments and those comments should tell you whether or not to purchase.
If you are not going to purchase your computer with the buy it now option, don’t immidiately put in a bid. Wait until the auction is almost over. When the auction is down to the last five minutes or so, that’s when you should start bidding.. If you bid too early, you run up the auction price prematurely. Keep in mind, if you are looking at a great deal, you will need to watch closely when the time is near to end. One of the things to make sure you don’t do is get emotionally involved in the bid process. When people get emotional survey paid more than they should. Decide up front how much you’re going to pay and if the bid prices go past that amount stop. Pick another computer to bid on.
Soon enough, you will have your computer. Lastly, make sure you are aware of the shipping terms, and the credit terms. If you do not have paypal, or credit, you can usually buy with check or a wire. Just communicate with the seller.
So now you know how to get your cheap bargain laptop computer. Make sure you buy right.
If you are looking for a bargain laptop computer, Bargain Laptop Computer Shop has the best price on a cheap laptop computer. When you are ready to buy a laptop computer, our pricing can’t be beat.
March 27, 2008
Laptops
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Laptop computers are getting smaller and more advanced every day. Fortunately, prices have been coming down as well. While that is great news for consumers, it doesn’t change the fact that for most shoppers, a new laptop represents a large purchase - and most large purchases are made on a strict budget. Fortunately, it’s fairly simple to get the most bang for your buck while making sure that your new laptop has all the features that you need and doesn’t become quickly outdated. The key to buying a laptop on a budget is weighing needs versus wants in five main areas: size, screen, GPU, CPU, and RAM.
Size
For most shoppers laptop size is a matter of personal preference, but when buying a laptop on a budget, size can be a major deal-breaker because a specific size preference may not be in the budget - no matter which features you give up. The most economical laptops weigh in the 6- to 8-pound range. Laptops outside of this range are usually specifically designed to meet other criteria (like an ultra portable at 3 pounds, or a desktop replacement that rivals the power of a desktop), and thus they carry a premium. Stick to the mid-sized laptops, and your small budget will stretch that much further for the other components.
Screen
Screen size and laptop size are fairly dependent on each other, so if you stick to mid-sized laptops, there won’t be many options for the LCD screen. While that may not seem like great news, the 15-inch screen that comes on most mid-sized laptops is more than adequate for most uses; and if this is not sufficient, then for stationary usage it is usually possible to attach a standard desktop monitor to the laptop to increase your screen real estate. If you have a desktop already (as most people do), you probably have a very capable monitor already on your desk; make sure to confirm with your retailer that using a separate monitor is possible on the laptop that you have chosen.
GPU
The video card (or GPU - graphics processing unit) is the component that actually renders the images that appear on the screen. There are generally only two options for this component, but when buying a laptop on a budget you really only have one choice - shared video. Now certainly the other option, a dedicated video card, produces far better results under demanding conditions; but shared video, where the video card actually shares the RAM of the computer versus having its own, is perfectly fine for daily use and is certainly more affordable. It is important to note that a shared video card generally will not play current computer video games, so if that is important to you, it’s probably best to wait until you have more money; or instead use your laptop budget to buy a more affordable desktop that can handle playing a graphics-intensive game.
CPU
The CPU is one area where you can really save some money! Don’t get caught up in the hype of the newest processor on the market; it’s easy to feel pressure to buy the latest and greatest technology so your laptop isn’t obsolete the day after purchase, but with the central processing unit, or CPU, you can safely go a few steps down from the current processor to save some major cash. You likely won’t even notice that you have made a compromise, and this will give you some money to put into other areas of the laptop.
RAM
The RAM, or random access memory, gives your laptop thinking power. If you have ever experienced delays when accessing programs, or annoying freezes when trying to do too many things at once, you have witnessed a computer begging for more RAM. Mid-range laptops often come with 256 MB of RAM. With this was once sufficient, 1 GB is now more suitable due to more advanced applications. But don’t worry - RAM is one area that you can usually upgrade later. If adding the RAM to your system during the shopping process doesn’t make economic sense, you might consider buying more RAM later either online or at a local box store - simply make your laptop purchase now, and save up to add more RAM later. Either way, adding more RAM will generally give you a better overall experience, and you won’t feel as if you bought a budget-conscious laptop after all.
The laptop-buying experience should be fun and exciting, but if you are buying on a budget, unless you shop carefully you could wind up feeling as if you bought an inferior, outdated product. It’s easy to avoid these feelings by simply making sure that you get the things that you really need, and avoiding some of the more expensive but nonessential ‘wants.’ Most importantly, take your time, do your research, and feel very comfortable with your final purchase. A budget-priced laptop can take you well into the future, without leaving you with an empty wallet!
Laura Alter is a part of http://www.NotebooForums.com - the largest laptop discussion site on the Internet. Since 2003, NotebookForums.com has been hosting discussions about Dell, Alienware, Sony, Apple, Toshiba and many other notebook brands, laptop reviews, photos, and peer-to-peer tech support.
March 27, 2008
Laptops
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Laptops are more affordable then ever. Prices have dropped enough to make laptops available to most consumers who need a mobile computer for school, work or personal use. Even though they are more affordable, buying a laptop is still a major investment. One way to soften the financial blow is by purchasing a used or refurbished laptop from either a private seller, a retail vendor or a liquidator who is clearing out off-lease laptops. While the price may be lower, there are many things consumers must learn before buying a used laptop. Shoppers must: know the seller, know the products, and know where to buy.
Know the Seller
There are only three types of used or refurbished laptop sellers: retailers, private sellers, or scammers. It’s imperative to know from whom you are buying because that determines how you approach the buying process. You deal with a private seller very differently from an online retailer. Of course, if the online merchant is a reputable e-commerce site (some examples listed below), then you shouldn’t need to worry about this, but there are some great deals to be found online if you stay educated and wander outside the standard computer stores. There are several red flags to watch out for when determining with whom you are dealing (and if you should deal with them at all!):
- Check the feedback. Is there a feedback system on the site? If the seller seems to be a merchant, do they have consistent track record providing the product you want to purchase? If the seller seems to be an individual, do they have more than one model for sale? It would be unusual for a private seller should to have more than one model for sale at a time - if they do, be suspicious.
- Check the payment method. Are the payment terms odd or inconvenient? Do they only accept Western Union? (Never send money via WU to someone you don’t know. There is no recourse if you have trouble, and scammers know this!)
- Check the seller’s location. If the seller is international, this shouldn’t be an immediate red flag, but if they are international and offer free shipping, this is a major red flag. This wouldn’t be cost efficient for anyone but a scammer.
- Check the photos. Are there any actual photos of the laptop? Generally, a scammer doesn’t have the actual product in hand to take photos, but keep in mind that they can easily swipe photos from a personal website. The absence of real product photos does not indicate a scam, but it should be considered as a part of the bigger picture.
- Check the time. Is the seller in a major hurry? Is it a 2-day auction? Legitimate sellers can also be a in a hurry, but if you feel that the seller is really rushing, make sure to take this into account.
- Check the deal. You know what they always say: “If it sounds too good to be true…” I hate to be the bearer of bad news, but totally unbelievable deals are just that - not believable.
Bottom line: If you feel suspicious, listen to your gut. A private seller that is trying to come off as a retailer will probably have holes in their story that you can expose by checking for red flags. A private seller trying to scam you probably won’t have their ducks in a row well enough to pull off a swindle on an educated consumer.
Know the Products.
There is a difference between a used laptop and a refurbished (reconditioned, remanufactured) laptop. A used laptop is just that - used by another person for a certain period of time and now it needs a new home. Perhaps the seller has cleaned up the notebook for sale, erased the hard drives, and gathered up all the original manuals and packaging, but it’s possible he has done none of that. Refurbished, on the other hand, usually describes a notebook that has been returned to the manufacturer, repaired, cleaned-up, repackaged, and sent out with a short warranty period attached. These laptops are generally sold by an online retailer, so you often have the security of knowing you may be able to hold them accountable for problems (though you can’t be sure of this - check their specific policies). Of course, ‘refurbs’ also come with a higher price tag, but you pay for that added security. It’s possible that a refurbished system will have some light surface scratches, but most often you can’t even tell that the unit was ever used.
Some things to keep in mind when shopping for a used (not refurbished) laptop:
- You will probably need to buy a new battery. There are specific draining and charging procedures for laptop batteries. Chances are that the seller did not always follow these procedures (does anyone?). Make sure to account for the price of a new battery when you are shopping so you aren’t hit with an unexpected after-purchase cost.
- You really have no idea what that laptop has been through. Laptops were created to be mobile. You really don’t (and can’t) know how many times that laptop was dropped, spilled on, walked on, etc. While the seller is obligated to disclose any known defects, you can’t be certain to you are hearing the whole story. These undisclosed accidents could cause you problems down the line.
- Expect some scratches. With movement comes scratches, so depending upon the age, expect a certain amount of wear and tear. If you are prepared for this, you won’t be as disappointed. If it doesn’t affect the performance of the computer, try not to worry about it.
Know Where to Buy.
While you can scour any laptop-related site for potential for sale ads, you also end up wasting a great deal of time that way! Instead, there are a handful of high-traffic websites out there that consistently have used laptops and refurbished laptops for sale. Here are a few:
http://ebay.com
http://overstock.com
http://tigerdirect.com/applications/overstock/
http://techdepot.com/clearance.asp
http://notebookforums.com/forum25.html
If you are in the market for a used or refurbished laptop, you should take some time to get familiar with market conditions and the systems that tend to become available. If you are researching on Ebay, watch some auctions to see how the bidding goes. Get very comfortable with used laptop pricing before you get emotionally attached to any one system. If you are shopping in a more retail environment, like TigerDirect.com, you won’t need to watch prices change like an auction, but the inventory changes often and if you don’t see what you want there now, keep checking back. Make sure to check return policies on refurbished systems to avoid any possible buyer’s remorse.
Used and refurbished laptops provide an excellent opportunity to get a nice laptop at a very nice price. While the prices are much easier to swallow than new units, buying used does come with a certain set of risks. Education is power here (and money in your pocket, in the case of a scam), so stay ahead of the game and don’t rush into any to-good-to-be-true deal without making sure you know what you are getting. If you do your due diligence, you should end up with a quality system for a fraction of the new price.
Laura Alter is a part of http://www.NotebooForums.com - the largest laptop discussion site on the Internet. Since 2003, NotebookForums.com has been hosting discussions about Dell, Alienware, Sony, Apple, Toshiba and many other notebook brands, laptop reviews, photos, and peer-to-peer tech support.
March 27, 2008
Laptops
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Few things are more important in an office than what comes off the photocopier. That one machine being broken can bring the busiest office to a halt within seconds. It is very important to take good care of your photocopier. Additionally, because of the nature of the machine, the copies that it produces are important, as they are intended to be distributed to people.
When looking at paper for your photocopier, there are many, many types of paper to get confused with. There is computer paper, Laser paper, InkJet paper, photo paper, matte paper, glossy paper, printer paper, recycled copy paper, and copy paper. Many of these paper types won’t fit or look good in your typical photocopier, so we shall remove the continuous sheets of paper used by the old Dot Matrix printers and all related types of
The issues you will want to look at when choosing your paper are the weight, brightness, opacity, and smoothness. All these factors will affect the durability and quality of the print you’re making.
When looking at the weight of paper, it is figured by the weight of a 500 sheet slab of 17 x 22 inches (4 times the area of a normal sheet of paper). The average use in offices these days is 20 lb paper. The heavier the paper, the more durable it is, and it has a better feel to it. Heavier paper should be used for presentations, as well as extremely high quality applications.
Opacity is a measure of how much light passes through a piece of paper. The less light passes through, the more opaque it will be. The heavier the paper, the more opaque it tends to be. Standard 20 lb paper is relatively clear, and, as such, should not be used for presentations against a lit background.
Brightness is the contrast of the paper, and how far from white it appears to be. The higher the contrast number (normal paper ranges from 80 to 100), the better your copies will look.
Smoothness is simply how smooth the paper is. Different printers print different ways. Laser printers and copiers (of which you probably have one) use toner and ink, and benefit greatly from a smoother paper. Inkjet printers use waterbased ink, with dries faster and produces a better image on on rougher textured paper.
As you can see, the choice of the paper to use in your office copier really hangs on what you’re using the machine for. If you’re using it to print off a presentation for clients, go with the smooth heavy weight bright paper. But if you’re only using it for internal affairs for which quality isn’t extremely important, as long as the message can be read, the go with the standard cheap 20 lb paper. It’s cheap, in ready supply, and it works extremely well for most applications.
As for those old perforated nearly endless strips of Dot Matrix paper… well, give those to the kids to make some confetti for the office opening party.
Quality Cartridges opens up a world of cheap compatible inkjet printer cartridges for all you ink needs home and office needs.
Find out how much money you could save by visiting http://www.quality-cartridges.co.uk We carry stock of Epson, HP, Lexmark and Canon Cartridges
March 27, 2008
Laptops
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My Acer laptop computer has changed my life. In fact, I can say quite honestly, that it has revolutionalized the way that I work. It has made me much more productive and efficient overall. How, you might ask? As a writer, I need to remove myself from the distractions at home. And I would much prefer to work in the quiet, soothing atmosphere of a coffee shop. But doing so in the past meant recording everything with pen and paper and then retyping it upon my return home. What a waste of time. But now, my life has changed.
Owning my Acer meant not only that I could leave my home and work from the coffee shop, but I could leave town and still work. If I needed to travel for business, I had my work right there with me, on the plane, in the airport, in my motel. The Acer even affected my social life. Instead of finding myself bogged down, I can just type up my reports and head out the door to meet my friends for a night on the town. I don’t even have to stop at home. I can just pack my laptop up, slip it in the car, and then enjoy the rest of the evening with friends. Work and play have become one.
To make my Acer more productive and efficient, I had to modify its operating system. Instead of relying on the old standby of Windows, I converted the operating system to red hat linux. Linux offered a faster and more stable system than windows, which has recently made computers more vulnerable to viruses than linux. In a nutshell, windows can kill your system. It slows it down and opens the door up for a plethora of viruses.
I also learned that to rely on my laptop, I needed to maintain it and protect it. Laptops are much more vulnerable to damage than a desktop, simply because we carry them everywhere we go. How often do you lug a computer tower around? Thus I recommend investing in a hard case. Sure, soft cases are cheaper and easier to carry, but in the end, you will want a hard case to protect this high dollar investment that you just saved a couple months worth of paychecks for.
Because of their vulnerability to damage, laptops should also be backed up frequently, daily if possible. No one wants to lose valuable information, so back up your information on a flash drive or CD. Consider using your desktop as a backup as well for the information on your laptop.
My Acer has saved me days of work. I find myself enjoying my job even more now that I am not chained to the same desk in the same room for hours. And I find myself enjoying life more when I know that I can just pick up and go in a moment’s notice.
Gregg Hall is an author living in Navarre Florida. Find more about this as well as personal computers at http://www.personalcomputersplusmore.com
March 26, 2008
Laptops
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I admit it. I am hooked. I am hooked on my Apple G4 Laptop. First, you have to know this. It is my first Apple and my first laptop. I always thought that laptops are what you used when you could not buy a real computer. Now I hang my head in shame for ever thinking that.
The Apple G4 laptop may be all you will ever need to buy in a computer. The G4 runs very fast so that you can play all the new games that require a lot of processor speed. Although for my Apple G4 laptop, I installed extra memory because I sometimes work with large documents.
This laptop is slick and compact with all the features you need. You can get the Apple G4 has a built in CD/DVD reader and CD writer. You can also add on a DVD writer.
The Apple G4 laptop comes with a track pad that works very well even for a person like me with fat, clumsy fingers. But I have to tell you the truth. I like a mouse, which by the way, Apple invented. So, I plugged in a mouse to one of the two USB ports and now it performs exactly like my old desktop. The Apple G4 laptop keyboard has the feel of a desktop with all the function keys. Except the number keypad is integrated with the alphabet keys so you have to press a function key to get them to work as number input. This is annoying but it is the same as all laptops.
One other thing that is truly great about the Apple G4 laptop is the built-in speakers and microphone. You do not need to by a headset with the unit. I did add plug-in speakers for better music quality but it is not necessary and remember this. With the built-in microphone, you are instantly ready for web voice chat.
As with all Apples, the G4 laptop has automatic software updates from the Internet. Just hook up to the Net and it automatically calls home for updates. No checking the website, no figuring out what you need. The operating and installed apple software is updated automatically.
The LCD screen has great resolution and color quality and tilts to every position you need if you do decide to take with you off the desk. Also, the battery runs for at least three hours or more for normal no-sound applications.
The Apple G4 laptop is a neat, clean package that gives you both the feel and performance of the biggest desktop computer. You are sacrificing nothing but space to own this unit.
Mr James has owned The Cartridge Specialists (Melbourne) since 2004 selling ink, toner, fax rolls etc & regularly writes articles about his industry
March 26, 2008
Laptops
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The average person who uses a personal computer on a frequent basis doesn’t think about what happens inside a personal computer once the electricity is switched on. As long as their version of MS Windows pops up within a few seconds, most people are quite happy to continue on with what they want to do on their personal computer. A personal computer goes through many processes from the moment the electricity is switched on before its operating system (ex. Windows, Linux) is fully loaded and takes over. The operating system is stored on the hard drive of a personal computer. It is stored on the hard drive because this kind of storage is much less costly and an operating system requires a large amount of storage space. So, in order to make personal computers more inexpensive, they are designed to use a mixture of ROM, DRAM, and hard disks. An account of each follows.
Once the electricity switch is switched on, the “boot-up” process begins. To “boot-up” a personal computer merely means to initiate it. Electricity then moves through all of the chips and their circuits. The instructions for what the personal computer is meant to do next are found in the Read Only Memory, Basic Input/Output System (ROM BIOS). ROM is memory that can only be read from and has data that is permanently burned into it. It is nonvolatile and will not be lost or vanish once the electricity is switched off.
ROM BIOS or just BIOS, is intended to begin giving instructions as soon as it receives electricity. The BIOS contains an entire set of instructions, in effect a personal computer program written into the chip that manages the boot-up process. Without the BIOS, the personal computer would’nt know what to do next. The first task that BIOS completes is to make sure that all of the hardware components are working properly (for example: disk drives, external buses, the mouse, the printer). This is called a electricity-on self-test (POST). After the POST is complete, the BIOS activates other chips on different cards installed in the personal computer (SCSI and graphics cards) and provides a set of low-level routines that the operating system uses to interface to different hardware devices such as the keyboard, mouse, printer, etc.
Once the POST is complete, the BIOS hands the next stage in the boot-up process over to the central processing unit (CPU). The central processing unit is a one chip processor or microprocessor that has two distinctive capabilities:
1. The CPU carries out all of the mathematical and logical operations including basic math and comparisons of two or more numbers.
2. The central processing unit has the ability to intelligently manage the flow of instructions and data going into and out of its circuits.
The final instruction that the ROM sends to the CPU is to go to a precise location or address to locate its next instruction. An address is a string of numbers that gives instructions to where something can be found, much like an address on an envelope. Personal computers use addresses to keep track of data much the same way as the post office uses them to locate residences and businesses. The larger the number in an address the more locations it can refer to. Most present personal computers use a 32-bit address space for memory, which indicates that there can be over four billion separate locations to contain data.
The instruction that the ROM BIOS wants the central processing unit to carry out is sent through a chip on a bus (a set of wires) to the address specified. The data bus is able to carry data into and out of the chip inside the CPU. The data isn’t available inside the CPU so it has to search elsewhere. The CPU then sends the address on another bus called an address bus. When the CPU does this, it is called a fetch. The address bus is “fetching” data from elsewhere inside the personal computer. The address bus is only able to carry instructions out of the CPU.
The address bus fetches data from the personal computer’s memory. Memory is a kind of silicon chip that can contain instructions or data. This kind of memory can be read from or written to by the CPU, but this kind of memory or Dynamic Random Access Memory (DRAM) is volatile. Once the electricity is switched off, the DRAM looses its memory or data. Since the DRAM is basically a blank slate, the CPU has inside, a set of sequential instructions as to where to search for the required data.
Before the address bus can get to memory, it has to pass through a set of chips called a chipset. The chipset refers to a collection of chips that provide an intelligent interface for the core workings of a personal computer - central processing unit, memory, graphics, I/O system, described as core logic or glue logic. If the data that the chipset needs isn’t in memory, the chipset then sends or redirects it to the Input/Output (I/O) bus. The I/O bus connects the chipset to supplementary places where the data is stored, such as the hard drive. The hard drive permits the CPU to read from it and to write to it. The hard drive is non-volatile so it keeps its data or data once the electricity is switched off. A hard disk is much slower at retrieving data from than memory but memory is much more costly.
Once the hard drive gets the address (via the I/O bus and chipset), it retrieves the data and sends it back through the chipset and then puts it on the address bus back into the CPU. The chipset functions as a bridge for the two buses; the I/O bus and the address bus.
The central processing unit uses a four step sequence: fetch, decode, execute, and store. Since the CPU does not retain its memory, it has to obtain its data or fetch the data from elsewhere inside the personal computer. To help with the speed of the process of fetching, the CPU has a pre-fetch area to make the data available more readily.
Once the data has been fetched, it has to be decoded. Part of the decoding process of the CPU is to decide which circuits are appropriate to use for executing the instructions. Once that decision has been made, the CPU begins to execute the instructions. The part of the CPU where the actual execution of instructions takes place is called the Arithmetic Logical Unit (ALU). The ALU includes groups of transistors, known as logic gates, which are organized to carry out basic mathematical and logical operations. Logic gates are grouped into electrical circuits that execute the CPU’s instructions such as “add” two numbers or “compare” two numbers.
The final step of the central processing unit is to store the data. This final step takes place after the ALU completes its calculations. The results of the calculations are stored on a chip that has an area called a register. Registers can be accessed more quickly than any other kind of memory but are only for temporary containing (storage) of data.
The CPU also has a clock inside it to keep the timing of all of the flow of data and processes of the personal computer. This clock is vital to the synchronization of all of the processes of the personal computer. This CPU clock controls all of the operations on its chip. The processes of the CPU can also be interrupted by an external interrupt controller chip which is part of the chipset. The chipset contains a small database of interrupt vector (numerical table). When an interrupt signal comes onto the chip, the CPU saves what it is doing and goes to the interrupt vector to locate the address of the instruction that the interrupt is telling it to execute instead. Once it is finished with the interrupt, it goes back to what it was doing. The CPU locates what it was doing in a register called a stack. If interrupts were not possible, the CPU would have to complete one task before it could start another causing the speed to be greatly reduced.
Now that the central processing unit has found the operating system, loaded it into memory, the operating system takes over and the personal computer is now ready to be used by its owner. The user can now check email, play a game, or do whatever they wanted to do when they started the personal computer.
Mr James started My Business Tips Online (Melbourne) in 2006 providing business advice, tips, tutorials etc & regularly writes articles about his industry - full article here